[PATCH 6.9 104/374] perf symbols: Remove map from list before updating addresses

Greg Kroah-Hartman
2024-06-06T14:09:04Z

From: James Clark <james.clark@arm.com>

[ Upstream commit 9fe410a7ef483a9aca08bf620d8ddfd35ac99bc7 ]

Make the order of operations remove, update, add. Updating addresses
before the map is removed causes the ordering check to fail when the map
is removed. This can be reproduced when running Perf on an Arm system
with a static kernel and Perf uses kcore rather than other sources:

$ perf record -- ls
$ perf report

util/maps.c:96: check_invariants: Assertion `map__end(prev) <=
map__start(map) || map__start(prev) == map__start(map)' failed

Fixes: 659ad3492b913c90 ("perf maps: Switch from rbtree to lazily sorted array for addresses")
Signed-off-by: James Clark <james.clark@arm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240507141210.195939-2-james.clark@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/perf/util/symbol.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 9ebdb8e13c0b8..cd825241e07d9 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1375,13 +1375,15 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
if (RC_CHK_EQUAL(new_map, replacement_map)) {
struct map *map_ref;

- map__set_start(map, map__start(new_map));
- map__set_end(map, map__end(new_map));
- map__set_pgoff(map, map__pgoff(new_map));
- map__set_mapping_type(map, map__mapping_type(new_map));
/* Ensure maps are correctly ordered */
map_ref = map__get(map);
maps__remove(kmaps, map_ref);
+
+ map__set_start(map_ref, map__start(new_map));
+ map__set_end(map_ref, map__end(new_map));
+ map__set_pgoff(map_ref, map__pgoff(new_map));
+ map__set_mapping_type(map_ref, map__mapping_type(new_map));
+
err = maps__insert(kmaps, map_ref);
map__put(map_ref);
map__put(new_map);
--
2.43.0